*{
    padding: 0px;
    margin: 0px;
    list-style: none;
}
a{
    text-decoration: none;
}
.first{
     width: 100%;
     height: 40px;
     /* border: 1px solid black; */
     background-color: #333;
}
.first-center{
    width: 1226px;
    height: 100%;
    /* border: 1px solid red; */
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
}
.first-center-left{
    width: 704px;
    height: 100%;
    /* border: 1px solid black; */
}
.first-center-left ul{
    display: flex;
    line-height: 38px;
    color:#B0B0B0;
    font-size: 12px;
}
.first-center-left li:not(.li-first):before{
    content: "|";
    padding: 0 10px;
}
.first-center-right{
    height: 100%;
    width: 264px;
    /* border: 1px solid black; */
}
.first-center-left li:not(.li-first):before{
    content: "|";
    padding: 0 4px;
}
.first-center-right{
   display: flex;
   justify-content: space-between;
   line-height: 38px;
   position: relative;
}
.first-center-right ul{
   display: flex;
  
}
.first-center-right ul li{
   color: #B0B0B0;
   font-size: 12px;
   cursor: pointer;
}
.second{
    width: 100%;
    height: 100px;
    /* border: 1px solid black; */
}
.second-center{
    width: 1226px;
    height: 100%;
    /* border: 1px solid red; */
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.second-center-left{
    width: 50px;
    height: 50px;
    /* border: 1px solid black; */
}
.second-center-left .xiaomi-logo{
    width: 50px;
    height: 50px;
    background-image: url(./HTML阶段测试/学生用资源/image/xiaomi_logo.png);
    background-repeat: no-repeat;
}
.second-center-center{
    width: 700px;
    height: 100%;
    /* border: 1px solid black; */
}
.second-center-center ul{
    display: flex;
    line-height: 100px;
    justify-content: flex-end;
    margin-left: 10px;
}
.second-center-center ul li{
    padding:0 10px;
    font-size: 16px;
}
.second-center-right{
    width: 300px;
    height: 50px;
    border: 1px solid black;
    display: flex;
}
.second-center-right-left{
    width: 250px;
    height: 50px;
    border: 1px solid black;
}
.second-center-right span{
    text-align: center;
    line-height: 42px;
    width: 50px;
    height: 50px;
    border: 1px solid black;
}
.third{
    width: 100%;
    height: 465px;
    /* border: 1px solid black; */
    margin-top: 20px;
}
.third-center{
    width: 1226px;
    height: 100%;
    /* border: 1px solid red; */
    margin: 0 auto; 
    display: flex;
}
.third-center-left{
    width:300px;
    height: 100%;
    border: 1px solid black;
    background-color: rgba(206, 37, 37, 0.808);
}

.third-center-right{
    height: 100%;
    width: 926px;
    /* border: 1px solid blue; */
    background-image: url(./HTML阶段测试/学生用资源/image/T1vWdTBKDv1RXrhCrK.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.third-center-left ul{
   align-items: center;
   
}
.third-center-left ul li{
    width: 300px;
    height: 49px;
    border: 1px solid red;
    
}
.third-center-left ul span{
    width: 30px;
    height: 30px;
    border: 1px solid black;
}
.fourth{
    width: 100%;
    height: 171px;
    /* border: 1px solid red; */
    margin-top: 20px;
}
.fourth-center{
    width: 1226px;
    height: 100%;
    /* border: 1px solid black; */
    margin: 0 auto;
    display: flex;
}
.fourth-center-left{
   width: 228px;
   height: 170px;
  
}
.fourth-center-left ul li{
    border: 1px solid black;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-around;
    background-color: #B0B0B0;
}
.fourth-center-right{
   width: 998px;
   height: 170px;
   /* border: 1px solid red; */
   display: flex;
   justify-content: space-around;
}
.fourth-center-right-left{
    width:316px;
    height: 100%;
    /* border: 1px solid black; */
}
.fourth-center-right-center{
    width:316px;
    height: 100%;
    /* border: 1px solid black; */
}
.fourth-center-right-right{
    width:316px;
    height: 100%;
    /* border: 1px solid black; */
}
.fourth-center-left ul{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.fourth-center-left li{
    width: 72px;
    height: 82px;
    /* border: 1px solid black; */
}
.fifth{
   width: 100%;
   height: 400px; 
   /* border: 1px solid black; */
   margin-top: 20px;
}
.fifth-center{
    width: 1226px;
    height: 100%;
    /* border: 1px solid blue; */
    margin: 0 auto;
}
.fifth-center-head{
   width: 100%;
   height: 58px;
   /* border: 1px solid black; */
   display: flex;
   justify-content: space-between;
}
.fifth-center-down{
    width: 100%;
    height: 339px;
    /* border: 1px solid black; */
}
.fifth-center-head p{
    width: 200px;
    height: 100%;
    /* border: 1px solid green; */
    line-height: 70px;
    font-size: 20px;
}
.fifth-center-head span{
    width: 80px;
    height: 100%;
    /* border: 1px solid green; */
    line-height: 74px;
    cursor: pointer;
}
.fifth-center-down ul{
    display: flex;
    justify-content: space-between;
}
.fifth-center-down ul li{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-around;
}
.fifth-center-down ul li img{
    width: 160px;
    height: 160px;
}
.fifth-center-down ul li{
    width:234px;
    height: 339px;
    border-top: 1px solid red;
}
.sixth{
    width: 100%;
    height: 672px;
    /* border: 1px solid black; */
    margin-top: 20px;
}
.sixth-center{
    width: 1226px;
    height: 100%;
    /* border: 1px solid red; */
    margin: 0 auto;
}
.sixth-center-head{
    width: 100%;
    height:58px;
    /* border: 1px solid blueviolet; */
    display: flex;
    justify-content: space-between;
}
.sixth-center-head p{
    width: 100px;
    height: 100%;
    /* border: 1px solid red; */
    line-height: 70px;
    font-size: 20px;
}
.sixth-center-head span{
    width: 100px;
    height: 100%;
    /* border: 1px solid red; */
}
.sixth-center-down{
    display: flex;
}
 .sixth-center-down-left{
    width: 234px;
    height: 614px;
    /* border: 1px solid red; */
}
.sixth-center-down .sixth-center-down-right{
    flex:1;
   display: flex;
   flex-wrap: wrap;
   justify-content: space-around;
}
 .sixth-center-down-right li{
    width: 220px;
    height: 300px;
    border: 1px solid black;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-around;
}
.seventh{
    width: 100%;
    height: 272px;
    border: 1px solid red;
    
}
.seventh-center{
    width: 1226px;
    height: 100%;
    border: 1px solid black;
    margin: 0 auto;
}
.seventh-center-head{
    width: 100%;
    height: 80px;
    border: 1px solid red;
}
.seventh-center-down{
    width: 100%;
    height: 191px;
    border: 1px solid black;
}
.seventh-center-head ul{
    display: flex;
    justify-content: center;
}
.seventh-center-head ul li{
    width: 100px;
    height: 100%;
    line-height: 80px;
    text-align: 10px;
}
.seventh-center-head li:not(.thelast-li)::before{
    content: "|";
    padding: 0 4px;
}

